This site features maps of the paleogeography of the Southwestern US from 1.8 billion years ago to 10 million years ago. The images were prepared by placing stratigraphic, tectonic, and sedimentologic data on a base map, plotting land versus sea over this data, and then adding climatic data and detailed landforms such as mountains, shelf edges, rivers, arc-trench systems, and lowlands. The maps are ... Full description.

This site features seven PBS programs from around the world that explore the delicate relationship between humans and the natural environment, and the necessity of achieving a balance between the two. Programs contain both text and video, as well as links to other information sources. In addition to the seven programs, the site also features a photo gallery, definitions and information about global ... Full description.

This geospatial animation shows sea level rising across the land bridge between Siberia and Alaska. During the last Glacial Maximum (~21,000 years ago), the Bering Land Bridge was a vast tundra plain connecting Asia and North America. At that time, the global sea level was 120 meters lower than it is today. Melting ice sheets and glaciers caused the sea level to rise and flood the land bridge. A QuickTime ... Full description.